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 Post subject: is arc flash catagory reduced?
PostPosted: Mon Dec 08, 2008 11:39 am 
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Joined: Mon Dec 08, 2008 11:30 am
Posts: 2
When a mcc bucket is locked out does this affect the flash catagory rating? example a bucket rated a cat 3 is locked out do you still need cat 3 ppe to open the bucket to view the unit?


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PostPosted: Mon Dec 08, 2008 1:16 pm 
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Joined: Mon Jun 02, 2008 11:58 am
Posts: 1103
Location: Charlotte, NC
No it is not, the hazard exists from what is upstream of the MCC so locking it out changes nothing in that cell.


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PostPosted: Mon Dec 08, 2008 7:04 pm 
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Joined: Thu Jan 10, 2008 8:49 pm
Posts: 480
Location: New England
Arc Flash is about working on or near live parts. The only problem with a locked Mcc bucket is that it is only deenergized on the load side of the breaker or fuse switch - the line side is still energized. If the designed incorporated some type of shield or guard that prevented touching live parts then I think you could make a case for it being outside of AF requirements.


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